Spatial-temporal Evolution of Vegetation Coverage and Analysis of it's Future Trends in Wujiang River Basin

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Xiao, Jianyong^1,2,3 ; Bai, Xiaoyong^2,3 ; Zhou, Dequan^1 ; Qian, Qinghuan^1,2,3 ; Zeng, Cheng^1,2,3 ; Chen, Fei^1,2,3

School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang

550001, China^1

State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 99 Lincheng West Road, Guizhou Province, Guiyang

550081, China^2

Puding Karst Ecosystem Observation and Research Station, Chinese Academy of Sciences, Puding, Guizhou Province

562100, China^3

关键词: Comprehensive managements;    Ecological environment protections;    Ecological environments;    Protection and management;    Spatial-temporal characteristics;    Spatial-temporal evolution;    Variation characteristics;    Vegetation coverage;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/4/042066/pdf
DOI  :  10.1088/1755-1315/108/4/042066

来源: IOP

【 摘 要 】

Vegetation coverage dynamics is affected by climatic, topography and human activities, which is an important indicator reflecting the regional ecological environment. Revealing the spatial-temporal characteristics of vegetation coverage is of great significance to the protection and management of ecological environment. Based on MODIS NDVI data and the Maximum Value Composites (MVC), we excluded soil spectrum interference to calculate Fractional Vegetation Coverage (FVC). Then the long-term FVC was used to calculate the spatial pattern and temporal variation of vegetation in Wujiang River Basin from 2000 to 2016 by using Trend analysis and Hurst index. The relationship between topography and spatial distribution of FVC was analyzed. The main conclusions are as follows: (1) The multi-annual mean vegetation coverage reveals a spatial distribution variation characteristic of low value in midstream and high level in other parts of the basin, owing a mean value of 0.6567. (2) From 2000 to 2016, the FVC of the Wujiang River Basin fluctuated between 0.6110 and 0.7380, and the overall growth rate of FVC was 0.0074/a. (3) The area of vegetation coverage tending to improve is more than that going to degrade in the future. Grass land, Arable land and Others improved significantly; karst rocky desertification comprehensive management project lead to persistent vegetation coverage improvement of Grass land, Arable land and Others. Residential land is covered with obviously degraded vegetation, resulting of urban sprawl; (4) The spatial distribution of FVC is positively correlated with TNI. Researches of spatial-temporal evolution of vegetation coverage have significant meaning for the ecological environment protection and management of the Wujiang River Basin.